Identifying and suppressing interfacial recombination to achieve high open-circuit voltage in perovskite solar cells

By Juan‐Pablo Correa‐Baena, W. Tress, Konrad Domanski, E. H. Anaraki, Silver‐Hamill Turren‐Cruz, B. Roose, Pablo P. Boix, M. Graetzel, Michael Saliba, A. Abate and 1 more. 2017

228 citations recorded by the source corpus.

With close to 100% internal quantum efficiency over the absorption spectrum, photocurrents in perovskite solar cells (PSCs) are at their practical limits. It is therefore imperative to improve open-circuit voltages (VOC) in order to go beyond the current 100 mV loss-in-potential. Identifying and suppressing recombination bottlenecks in the device stack will ultimately drive the voltages up. In this work, we investigate in depth the recombination at the different interfaces in a PSC, including the charge selective contacts and the effect of grain boundaries. We find that the density of grain boundaries and the use of tunneling layers in a highly efficient PSC do not modify the recombination dynamics at 1 sun illumination. Instead, the recombination is strongly dominated by the dopants in the hole transporting material (HTM), spiro-OMeTAD and PTAA. The reduction of doping concentrations for spiro-OMeTAD yielded VOC's as high as 1.23 V in contrast to PTAA, which systematically showed slightly lower voltages. This work shows that a further suppression of non-radiative recombination is possible for an all-low-temperature PSC, to yield a very low loss-in-potential similar to GaAs, and thus paving the way towards higher than 22% efficiencies.

Subfields: Electrical and Electronic Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/9aa5976a2b51c9176ff5928a8631bc53a9b01ecd

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The perovskite/transport layer interfaces dominate non-radiative recombination in efficient perovskite solar cells (2018, methodology): “Methods that have been employed to measure interfacial recombination in perovskite stacks include transient photoluminescence (TRPL)(13,16,17) or reflection spectroscopy (TRS),(14) transient microwave conductivity (TRMC),(15) transient photovoltage (TPV)(18) or impedance spectroscopy.(11,19) Whilst ”